smug po chig thub
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སྨུག་པོ་ཆིག་ཐུབ
rock med mdung rtse smug po [IW]
(med) Goethite (Yeshi 2018)
smug po chig thub ni / smug po mdung rtse ste / rdo dmar smug ri mo bris na smug po 'dod pa rdog snga ma las chung ba ma gtogs dbyibs snga ma 'dra la brdung tshe rta spu ltar zhig pa'o // (Shel gong shel phreng, pdf p 118.6)
Illustrations : dGa' ba'i rDo rje 2018 (n°099) mdung rtse smug po, Goethite
The Shel phreng describes 4 minerals in a single notice :
smug po sbal rgyab (identified with the iron oxides Hematite),
dkar po sbal rgyab (identified either with Wollastonite or Limestone / Stalactites),
dkar po chig thub (identified with either Gypsum / Anhydrite or Wollastonite) and
smug po chig thub (identified with Goethite).
Goethite is the most common simple iron oxide mineral, yellow-brown or red-brown to black with dull, silky or metallic lustre. A weathering product of numerous iron-bearing minerals. It may also form due to mineralization of lichen (Parmelia conspersa) thalli on metamorphics (e.g., gneisses), granites, feldspars (mindat.org)
Johannes Schmidt (talk) 04:15, 28 February 2024 (EST)